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🐕🐈 Dogs & Cats
Weight Loss (Unexplained) in Pets
Unexplained weight loss — losing weight without a deliberate diet change — is always a reason to see your veterinarian. It can indicate diabetes, hyperthyroidism (cats), cancer, kidney disease, parasites, or malabsorption disorders. Early detection of the underlying cause significantly improves outcomes.
Use the Interactive Triage Tool
Answer a few quick questions to assess urgency for your pet's specific situation.
🚨 Seek Emergency Care Immediately If:
- ! Rapid weight loss (10%+ of body weight in a month)
- ! Complete appetite loss
- ! Lethargy or weakness with weight loss
- ! Vomiting or diarrhea with weight loss
- ! Distended abdomen despite losing weight elsewhere
ASPCA Poison Control: (888) 426-4435 · Pet Poison Helpline: (855) 764-7661
When to See Your Vet
- !Any unexplained weight loss (not from a deliberate diet)
- !Weight loss of 5%+ of body weight
- !Weight loss with increased thirst or urination
- !Weight loss with appetite changes
- !Weight loss in a senior pet
Home Monitoring & Care
- ✓Weigh your pet weekly to track the trend
- ✓Measure food intake precisely
- ✓Note any other symptoms (thirst, urination, energy changes)
- ✓Track how much water your pet drinks daily
Common Causes
Diabetes mellitusHyperthyroidism (cats)CancerKidney diseaseIntestinal parasitesInflammatory bowel diseaseExocrine pancreatic insufficiencyDental disease (pain prevents eating)Heart diseaseMalabsorption
Related Tools & Guides
Disclaimer:This guide is for educational purposes only. It does not replace professional veterinary advice, diagnosis, or treatment. Always consult your veterinarian for your pet's specific health concerns.